Author Lawrence Wright has penned a tell-all book about the inner workings of the Church of Scientology and notable members Tom Cruise and John Travolta, and RadarOnline.com has learned it will be released in January.

Wright originally wrote a profile for The New Yorker a couple of years ago about screenwriter Paul Haggis, who left the Church of Scientology, and now it will be published as a full-length book version with 150,000 copies printed to hit the shelves, the Hollywood Reporter reports.

In Wright’s New Yorker article, he took three years to research and interviewed more than 200 former and current Scientology members.

The tell-all book will detail the church’s history, its financial status, how it relates to Hollywood — and will take a close look at founder L. Ron Hubbard and sometimes controversial leader David Miscavige.

“Scientology plays an outside role in the cast of new religions that have arisen in the twentieth century,” Wright said in a statement.

“I was drawn to write this book by the questions many people have about Scientology: What is it that makes this religion alluring? What do its adherents get out of it? How can rational-seeming people subscribe to beliefs that others find incomprehensible? Why do popular personalities associate themselves with a faith that is likely to create public relations martyrdom?”